It is not a bug as far as I know. However, you can change who shows up in your chat list.
In Google+ go the the chat section and press the little arrow pointing down. Then go to privacy settings and select which Circles you want to show up in your chat.
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[ 2.1 ms ] story [ 9.9 ms ] threadIn Google+ go the the chat section and press the little arrow pointing down. Then go to privacy settings and select which Circles you want to show up in your chat.